7 lines (6 with data), 258 Bytes

m050b 0 128 0 10:45:00 08/12/1990
# Start time=10:45
# First beat=10:45:00.390
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.554,  <RR-high-limit(sec)>: 1.296
# Note: recording with a timing signal, flutter-compensated